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BSsq-lect20 chordata

BSsq-lect20 chordata - 4 Briefly outline Walter Garstang's...

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BIS 1B (Winter 2008) Study questions answers: Chordata Lecture 20 1. One of the traits that Chordates and Hemichordates share is pharyngeal gill slits. Can you trace the phylogenetic history of these gill slits through the various classes of chordates to mammals like yourselves? 2. Our nervous system is internal, yet it is derived from ectoderm. Explain how the internal nervous system can be formed from the outer ectoderm during the course of development. 3. What are 4 mayor characters that all chordates share? Draw a cladistic "tree" showing where these traits would occur with respect to the chordate branch.
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Unformatted text preview: 4. Briefly outline Walter Garstang's theory of paedomorphosis for the origin of the vertebrates. 5. How might the morphology of larvaceans shed light on the evolution of the vertebrates? 6. Describe how food is captured in a sessile tunicate. 7. What substance made by the body is often associated with filter–feeding? (Think of bivalves, larvaceans, tunicates, and some brittle stars. ) 8. List 2 phyla in which some members have a calcareous endo skeleton. 1...
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